compass-plant

compass plant

noun
any of various plants having leaves that tend to lie in a plane at right angles to the strongest light, hence usually north and south, especially Silphium laciniatum.

Origin:
1840–50

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compass plant
 
n
1.  Also called: rosinweed a tall plant, Silphium laciniatum, of central North America, that has yellow flowers and lower leaves that tend to align themselves at right angles to the strongest light, esp in a north-south plane: family Asteraceae (composites)
2.  any of several similar plants

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